Powder metallurgy duplicate gear machining die

Abstract

The utility model discloses a powder metallurgy duplicate gear machining die which comprises a die frame, two cavity mechanisms are arranged in the die frame, each cavity mechanism comprises a middle die, an upper punch and a lower punch, a cavity is formed in each middle die, and each upper punch and the corresponding lower punch can stretch into the corresponding cavity in the die assembly direction. The forming core rod can axially penetrate through the lower punch and extend into the cavity to be matched with the upper punch; according to the machining die, two stages of gear parts can be formed at the same time, and therefore the production efficiency of the duplicate gear is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy gear processing dies, in particular to a powder metallurgy combined double gear processing die. Background Art

[0002] Existing duplex gears include two-stage gear parts, which are formed by powder metallurgy pressing. During pressing, two molds are generally used to form the two-stage gear parts separately, and then the formed two-stage gear parts are assembled into a duplex gear. Since each stage of the gear part is formed separately, only one stage of the gear part is processed in one mold closing, which has low production efficiency and is not conducive to large-scale production and processing. Utility Model Content

[0003] The utility model aims to provide a powder metallurgy double gear processing die, which can simultaneously form two-stage gear parts, thereby improving the production efficiency of the double gear.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A powder metallurgy double gear processing mold includes a mold frame, two cavity mechanisms are arranged in the mold frame, and the two cavity mechanisms each include a middle mold with a cavity formed therein, an upper punch and a lower punch that can extend into the cavity along the mold closing direction, and a forming core rod that can axially penetrate through the lower punch and extend into the cavity to cooperate with the upper punch.

[0006] On the basis of the above technical solution, the present invention can be improved as follows:

[0007] Furthermore, the middle mold of the two cavity mechanisms includes a mold sleeve and a mold core arranged in the mold sleeve, a cavity is formed inside the mold core, and the mold core is provided with internal straight teeth on the inner wall of the cavity for guiding the upper punch and the lower punch to axially extend into the cavity of the mold core.

[0008] Furthermore, the upper punches of the two cavity mechanisms are provided with external straight teeth on the outer circumferential surface. When the upper punches extend into the cavity of the mold core, the external straight teeth on the outer circumferential surface of the upper punches cooperate with the internal straight teeth on the inner wall of the cavity of the mold core; the upper punches of the two cavity mechanisms are provided with an upper core rod insertion hole through the middle, one of the upper punches is provided with internal straight teeth on the hole wall of the upper core rod insertion hole, and the hole wall of the upper core rod insertion hole of the other upper punch is a smooth hole wall.

[0009] Furthermore, the next punch of the two cavity mechanisms is provided with external straight teeth on the outer circumference. When the next punch extends into the cavity of the mold core, the external straight teeth on the outer circumference of the next punch cooperate with the internal straight teeth on the inner wall of the cavity of the mold core; the next punch of the two cavity mechanisms is provided with a lower core rod insertion hole through the middle, one of the next punches is provided with internal straight teeth on the hole wall of the lower core rod insertion hole, and the hole wall of the lower core rod insertion hole of the other next punch is a smooth hole wall.

[0010] Furthermore, the outer peripheral surface of the forming core rod of one of the cavity mechanisms is provided with outer straight teeth that cooperate with the inner straight teeth of the lower core rod socket of one of the next punches, and the outer peripheral surface of the forming core rod of the other cavity mechanism is a smooth peripheral surface that cooperates with the lower core rod socket of the other next punch.

[0011] Furthermore, the mold frame includes an upper punch top plate, a middle mold mounting plate, a next punch top plate and a core rod mounting plate arranged in sequence along the mold closing direction, the upper punch top plate is connected to the upper punch, the middle mold mounting plate is connected to the middle mold, the next punch top plate is connected to the next punch, and the core rod mounting plate is connected to the forming core rod.

[0012] Furthermore, the upper punch top plate is provided with two upper punch mounting grooves and an upper punch cover which can cooperate with the upper punch mounting grooves on the bottom surface, and the upper punch mounting grooves and the upper punch cover cooperate with each other to fix the upper punch top plate.

[0013] Furthermore, the middle mold mounting plate is provided with two middle mold mounting grooves and a middle mold pressure cover that can cooperate with the middle mold mounting grooves on the top surface, and the middle mold mounting grooves and the middle mold pressure cover cooperate with each other to fix the middle mold.

[0014] Furthermore, the next punch top plate is provided with two next punch mounting grooves and a next punch cover that can cooperate with the next punch mounting grooves on the top surface, and the next punch mounting grooves and the next punch cover cooperate with each other to fix the next punch.

[0015] Furthermore, the core rod mounting plate is provided with two core rod mounting grooves and a core rod pressure cover that can cooperate with the core rod mounting grooves on the top surface, and the core rod mounting grooves and the core rod pressure cover cooperate with each other to fix the forming core rod.

[0016] Compared with the existing technology, the technology of this utility model has the following advantages:

[0017] The utility model provides two cavity mechanisms inside the same mold frame, and can form two cavities through the two cavity mechanisms when the mold is closed, and respectively form a first-stage spur gear part and a second-stage spur gear part through the two cavities. Through one mold closing, the processing of the two-stage spur gear parts can be completed at the same time, thereby effectively improving the production efficiency of the duplex gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 A schematic diagram of the structure of the double gear processed for the utility model;

[0020] Figure 2 A schematic structural diagram of the first-stage spur gear portion of the double gear processed for the utility model;

[0021] Figure 3 A schematic structural diagram of the secondary spur gear portion of the duplex gear processed for the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of a utility model powder metallurgy double gear processing mold.

[0023] Markings on the accompanying drawings: 1-double gear, 101-first-stage spur gear part, 101a-plug-in hole, 102-second-stage spur gear part, 102a-axis hole, 2-upper punch top plate, 3-middle mold mounting plate, 4-lower punch top plate, 5-core rod mounting plate, 6-guide column, 7-first upper punch, 8-first lower punch, 9-first forming core rod, 10-second upper punch, 11-second lower punch, 12-second forming core rod, 13-upper punch cover, 14-middle mold cover, 15-lower mold cover, 16-core rod cover, 17-first mold sleeve, 18-first mold core, 19-second mold sleeve, 20-second mold core. DETAILED DESCRIPTION

[0024] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. The description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] See also Figures 1 to 4 The utility model relates to a powder metallurgy double gear processing mold, which is used in conjunction with a vertical press to longitudinally mold and integrally form a double gear 1. The pressed double gear 1 includes a primary spur gear portion 101 and a secondary spur gear portion 102. The primary spur gear portion 101 is provided with a plug-in hole 101a for plugging in the secondary gear portion, and the secondary spur gear portion 102 is penetrated by a shaft hole 102a for inserting a rotating shaft.

[0026] The processing mold includes a mold frame and two cavity mechanisms arranged in the mold frame. The two cavity mechanisms can form two cavities inside the mold frame when the mold is closed to respectively form the first-level spur gear part 101 and the second-level spur gear part 102.

[0027] The mold frame includes an upper punch plate 2, a middle mold mounting plate 3, a lower punch plate 4 and a core rod mounting plate 5 which are arranged in sequence along the mold closing direction. Guide columns 6 are connected between the upper punch plate 2, the middle mold mounting plate 3, the lower punch plate 4 and the core rod mounting plate 5. The guide columns 6 are used to guide the upper punch plate 2, the middle mold mounting plate 3, the lower punch plate 4 and the core rod mounting plate 5 to move along the mold closing direction. The number of guide columns 6 can be increased or decreased according to actual needs. In this embodiment, four guide columns 6 are provided and distributed around the mold frame.

[0028] For the convenience of description, the two cavity mechanisms are named the first cavity mechanism and the second cavity mechanism respectively. The first cavity mechanism is used to form the first-stage gear part, and the second cavity mechanism is used to form the second-stage gear part.

[0029] The first cavity mechanism includes a first upper punch 7, a first middle die, a first lower punch 8, and a first forming core rod 9; the first upper punch 7 is arranged on the upper punch top plate 2, the first middle die is arranged on the middle die mounting plate 3, and a first cavity for forming a first-stage spur gear part 101 is formed inside the first middle die, the first lower punch 8 is arranged on the lower punch top plate 4, and the first forming core rod 9 is arranged on the core rod mounting plate 5 and inserted through the first lower punch 8; when the mold is closed, the upper punch top plate 2, the lower punch top plate 4 and the core rod mounting plate 5 move toward the middle die mounting plate 3 along the mold closing direction, so that: the first upper punch 7 and the first lower punch 8 axially extend into the first cavity inside the first middle die to form the first-stage spur gear part 101, the first forming core rod 9 passes through the first lower punch 8 and extends into the first cavity inside the first middle die to cooperate with the first upper punch 7 to form the connecting hole 101a set on the first-stage spur gear part 101.

[0030] The second cavity mechanism includes a second upper punch 10, a second middle die, a second lower punch 11, and a second forming core rod 12; the second upper punch 10 is arranged on the upper punch top plate 2, the second middle die is arranged on the middle die mounting plate 3, and a second cavity for forming the secondary spur gear part 102 is formed inside the second middle die, the second lower punch 11 is arranged on the lower punch top plate 4, and the second forming core rod 12 is arranged on the core rod mounting plate 5 and inserted through the second lower punch 11; when the mold is closed, the upper punch top plate 2, the lower punch top plate 4 and the core rod mounting plate 5 move toward the middle die mounting plate 3 along the mold closing direction, so that: the second upper punch 10 and the second lower punch 11 axially extend into the second cavity inside the second middle die to form the secondary spur gear part 102, the second forming core rod 12 passes through the second lower punch 11 and extends into the second cavity inside the second middle die to cooperate with the second upper punch 10 to form the axial hole 102a set on the secondary spur gear part 102.

[0031] The upper punch top plate 2 is provided with two upper punch mounting grooves and an upper punch cover 13 which can cooperate with the upper punch mounting grooves on the bottom surface. The top ends of the two upper punches are respectively installed in the two upper punch mounting grooves and fixed by the upper punch cover 13.

[0032] The middle mold mounting plate 3 is provided with two middle mold mounting grooves and a middle mold pressing cover 14 which can cooperate with the middle mold mounting grooves on the top surface. The two middle molds are respectively installed in the two middle mold mounting grooves and fixed by the middle mold pressing cover 14.

[0033] The top surface of the next punch top plate 4 is provided with two next punch mounting grooves and a lower die pressing cover 15 which can cooperate with the next punch mounting grooves. The bottom ends of the two lower dies are respectively installed in the two lower die mounting grooves and fixed by the lower die pressing cover 15.

[0034] The core rod mounting plate 5 is provided with two core rod mounting grooves and a core rod pressing cover 16 which can cooperate with the core rod mounting grooves on the top surface. The bottom ends of the two forming core rods are respectively installed in the two core rod mounting grooves and fixed by the core rod pressing cover 16.

[0035] The first middle mold includes a first mold sleeve 17 and a first mold core 18 arranged in the first mold sleeve 17; the first mold sleeve 17 is provided with a matching hole in the middle to match the first mold core 18, and the first mold core 18 is interference fit in the matching hole of the first mold sleeve 17. After matching, the end faces of the first mold core 18 and the first mold sleeve 17 are flush; the first mold core 18 is a cylindrical structure, and a first cavity is formed inside the first mold core 18. The first mold core 18 is provided with internal spur teeth on the inner wall of the first cavity, and the first upper punch 7 and the first lower punch 8 are guided by the internal spur teeth to axially extend into the first cavity of the first middle mold to form a first-stage spur gear part 101.

[0036] The second middle mold includes a second mold sleeve 19 and a second mold core 20 arranged in the second mold sleeve 19; the second mold sleeve 19 is provided with a matching hole in the middle to match the second mold core 20, and the second mold core 20 is interference fit in the matching hole of the second mold sleeve 19. After matching, the end faces of the second mold core 20 and the second mold sleeve 19 are flush; the second mold core 20 is a cylindrical structure, and a second cavity is formed inside the second mold core 20. The second mold core 20 is provided with internal spur teeth on the inner wall of the second cavity, and the second upper punch 10 and the second lower punch 11 are guided by the internal spur teeth to axially extend into the second cavity of the second middle mold to form the secondary spur gear part 102.

[0037] The first upper punch 7 is a cylindrical structure, and the outer circumferential surface of the first upper punch 7 is provided with external straight teeth. The external straight teeth on the outer circumferential surface of the first upper punch 7 cooperate with the internal straight teeth on the inner wall of the first cavity in the first mold core 18, so that the first upper punch 7 can axially extend into the first cavity inside the first mold core 18 when the mold is closed; the first upper punch 7 is provided with a first upper core rod insertion hole at the middle, and the hole wall of the first upper core rod insertion hole is provided with internal straight teeth.

[0038] The second upper punch 10 is a cylindrical structure, and the outer circumferential surface of the second upper punch 10 is provided with external straight teeth. The external straight teeth on the outer circumferential surface of the second upper punch 10 cooperate with the internal straight teeth on the inner wall of the second cavity in the second mold core 20, so that the second upper punch 10 can axially extend into the second cavity inside the second mold core 20 when the mold is closed; the second upper punch 10 is provided with a second upper core rod insertion hole at the middle, and the hole wall of the second upper core rod insertion hole is a smooth hole wall.

[0039] The first next punch 8 is a cylindrical structure, and the outer circumferential surface of the first next punch 8 is provided with external straight teeth. The external straight teeth on the outer circumferential surface of the first next punch 8 cooperate with the internal straight teeth on the inner wall of the first cavity in the first mold core 18, so that the first next punch 8 can axially extend into the first cavity inside the first mold core 18 when the mold is closed; the first next punch 8 is provided with a first lower core rod insertion hole at the middle, and the hole wall of the first lower core rod insertion hole is provided with internal straight teeth; the diameter of the first lower core rod insertion hole of the first next punch 8 corresponds to the diameter of the second cavity of the second mold core 20.

[0040] The second next punch 11 is a cylindrical structure, and the outer circumferential surface of the second next punch 11 is provided with external straight teeth. The external straight teeth on the outer circumferential surface of the second next punch 11 cooperate with the internal straight teeth on the inner wall of the second cavity in the second mold core 20, so that the second next punch 11 can axially extend into the second cavity inside the second mold core 20 when the mold is closed; the second next punch 11 is provided with a second lower core rod insertion hole at the middle, and the hole wall of the first lower core rod insertion hole is a smooth hole wall.

[0041] The first forming mandrel 9 is a round rod-shaped structure, and the outer circumferential surface of the first forming mandrel 9 is provided with external spur teeth. The external spur teeth on the outer circumferential surface of the first forming mandrel 9 cooperate with the internal spur teeth on the wall of the first lower mandrel insertion hole in the first lower punch 8, so that when the mold is closed, the first forming mandrel 9 can axially penetrate through the first lower punch 8 and extend into the first cavity inside the first mold core 18, and be inserted into the first upper mandrel insertion hole in the first upper punch 7 to complete the forming of the connecting hole 101a on the first-stage spur gear part 101; when the first forming mandrel 9 is inserted into the first upper mandrel insertion hole in the first upper punch 7, the external spur teeth on the outer circumferential surface of the first forming mandrel 9 cooperate with the internal spur teeth on the wall of the first upper mandrel insertion hole in the first upper punch 7.

[0042] The second forming core rod 12 is a round rod-shaped structure, and the outer peripheral surface of the second forming core rod 12 is a smooth peripheral surface. When the mold is closed, the second forming core rod 12 can axially penetrate through the second lower punch 11 and extend into the second cavity inside the second mold core 20, and be inserted into the second upper core rod socket in the second upper punch 10 to complete the forming of the shaft hole 102a on the secondary spur gear part 102.

[0043] During pressing, the top of the two lower punches is lower than the top of the cavity of the two middle molds, and the top of the two forming core rods is flush with the top of the two lower punches, and the cavities of the two middle molds are filled with metal powder; the upper punch moves toward the middle mold along the mold closing direction to extend into the cavity of the middle mold to extrude the metal powder; after molding, the upper punch exits the cavity of the middle mold, and the lower punch continues to move toward the middle mold to eject the two spur gear parts after pressing and molding, and the forming core rod exits the cavity of the middle mold to take out the two spur gear parts and assemble them into a double gear 1; in this embodiment, the processing of the first-level spur gear part 101 and the second-level spur gear part 102 can be completed at the same time through one-time mold closing, effectively improving the production efficiency of the double gear 1.

[0044] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the implementation methods of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structure of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A powder metallurgy double gear processing mold, including a mold frame, characterized in that: Two cavity mechanisms are provided in the mold frame, and both of the cavity mechanisms include a middle mold with a cavity formed inside, an upper punch and a lower punch that can extend into the cavity along the mold closing direction, and a forming core rod that can axially penetrate through the lower punch and extend into the cavity to cooperate with the upper punch.

2. The powder metallurgy double gear processing die according to claim 1, characterized in that: The middle mold of the two cavity mechanisms includes a mold sleeve and a mold core arranged in the mold sleeve. A cavity is formed inside the mold core. The mold core is provided with internal straight teeth on the inner wall of the cavity for guiding the upper punch and the lower punch to axially extend into the cavity of the mold core.

3. The powder metallurgy double gear processing die according to claim 2, characterized in that: The upper punches of the two cavity mechanisms are provided with external straight teeth on the outer circumference. When the upper punches extend into the cavity of the mold core, the external straight teeth on the outer circumference of the upper punches cooperate with the internal straight teeth on the inner wall of the cavity of the mold core; the upper punches of the two cavity mechanisms are provided with upper core rod insertion holes in the middle, one of the upper punches is provided with internal straight teeth on the hole wall of the upper core rod insertion hole, and the hole wall of the upper core rod insertion hole of the other upper punch is a smooth hole wall.

4. The powder metallurgy double gear processing die according to claim 3, characterized in that: The next punches of the two cavity mechanisms are provided with external straight teeth on the outer circumference. When the next punch extends into the cavity of the mold core, the external straight teeth on the outer circumference of the next punch cooperate with the internal straight teeth on the inner wall of the cavity of the mold core; the next punches of the two cavity mechanisms are provided with a lower core rod insertion hole in the middle, one of the next punches is provided with internal straight teeth on the hole wall of the lower core rod insertion hole, and the hole wall of the lower core rod insertion hole of the other next punch is a smooth hole wall.

5. The powder metallurgy double gear processing die according to claim 4, characterized in that: The outer circumference of the forming core rod of one of the cavity mechanisms is provided with external straight teeth that cooperate with the inner straight teeth of the lower core rod socket of one of the next punches, and the outer circumference of the forming core rod of the other cavity mechanism is a smooth circumference that cooperates with the lower core rod socket of the other next punch.

6. The powder metallurgy double gear processing die according to any one of claims 2 to 5, characterized in that: The mold frame includes an upper punch top plate, a middle mold mounting plate, a next punch top plate and a core rod mounting plate which are arranged in sequence along the mold closing direction. The upper punch top plate is connected to the upper punch, the middle mold mounting plate is connected to the middle mold, the next punch top plate is connected to the next punch, and the core rod mounting plate is connected to the forming core rod.

7. The powder metallurgy double gear processing die according to claim 6, characterized in that: The upper punch top plate is provided with two upper punch mounting grooves and an upper punch cover which can cooperate with the upper punch mounting grooves on the bottom surface. The upper punch mounting grooves and the upper punch cover cooperate with each other to fix the upper punch top plate.

8. The powder metallurgy double gear processing die according to claim 6, characterized in that: The middle mold mounting plate is provided with two middle mold mounting grooves and a middle mold pressure cover which can cooperate with the middle mold mounting grooves on the top surface. The middle mold mounting grooves and the middle mold pressure cover cooperate with each other to fix the middle mold.

9. The powder metallurgy double gear processing die according to claim 6, characterized in that: The next punch top plate is provided with two next punch mounting grooves and a next punch cover that can cooperate with the next punch mounting grooves on the top surface. The next punch is fixedly connected by the cooperation between the next punch mounting grooves and the next punch cover.

10. The powder metallurgy double gear processing die according to claim 6, characterized in that: The core rod mounting plate is provided with two core rod mounting grooves and a core rod pressure cover that can cooperate with the core rod mounting grooves on the top surface. The core rod mounting grooves and the core rod pressure cover cooperate with each other to fix the forming core rod.

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